Accès ouvert
2020
article
OpenAlex
М. Н. Ачасов, P. Adlarson, S. Ahmed, M. Albrecht et autres
We report the most precise measurements to date of the strong-phase parameters between ${D}^{0}$ and ${\overline{D}}^{0}$ decays to ${K}_{S,L}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ using a sample of $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector …
cn, ru, se, de, it, us, in, mn, tr, gb
(code pays fourni par la source)
Accès ouvert
2019
article
OpenAlex
М. Н. Ачасов, P. Adlarson, S. Ahmed, M. Albrecht et autres
We report the first observation of D^{+}→τ^{+}ν_{τ} with a significance of 5.1σ. We measure B(D^{+}→τ^{+}ν_{τ})=(1.20±0.24_{stat}±0.12_{syst})×10^{-3}. Taking the world average B(D^{+}→μ^{+}ν_{μ})=(3.74±0.17)×10^{-4}, we obtain R_{τ/μ}=Γ(D^{+}→τ^{+}ν_{τ})/Γ(D^{+}→μ^{+}ν_{μ})=3.21±0.64_{stat}±0.43_{syst}., which is consistent with the standard model expectation of lepton flavor universality. Using external inputs, our results give values …
cn, ru, se, de, it, mn, us, tr, gb
(code pays fourni par la source)
Accès ouvert
2017
article
OpenAlex
М. Н. Ачасов, S. Ahmed, X. Ai, O. Albayrak et autres
We report the first direct measurement of decays of the ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryon involving the neutron. The analysis is performed using $567\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ collision data collected at $\sqrt{s}=4.599\text{ }\text{ }\mathrm{GeV}$ with the BESIII detector at the BEPCII collider. We observe …
cn, ru, de, us, it, tr, nl
(code pays fourni par la source)
Accès ouvert
2016
article
OpenAlex
Fengpeng An, A. B. Balantekin, H. R. Band, M. Bishai et autres
This Letter reports a measurement of the flux and energy spectrum of electron antineutrinos from six 2.9 GWth nuclear reactors with six detectors deployed in two near (effective baselines 512 and 561 m) and one far (1579 m) underground experimental halls in …
cn, us, tw, ru, hk, cz
(code pays fourni par la source)
Accès ouvert
2015
article
OpenAlex
M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht et autres
Using a sample of $1.31\ifmmode\times\else\texttimes\fi{}{10}^{9}$ $J/\ensuremath{\psi}$ events collected with the BESIII detector at the BEPCII collider, the decays $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$ and $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ are investigated. The isospin-violating decay $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{0}{f}_{0}(980)$ with ${f}_{0}(980)\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi}$ is observed for the first time. The width of the ${f}_{0}(980)$ obtained from …
cn, ru, us, de, pk, it
(code pays fourni par la source)
Accès ouvert
2015
article
OpenAlex
M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht et autres
Using data samples collected with the BESIII detector operating at the BEPCII collider at 17 center-of-mass energies from 3.810 to 4.600 GeV, we perform a study of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}J/\ensuremath{\psi}$ and ${\ensuremath{\pi}}^{0}J/\ensuremath{\psi}$. The Born cross sections of these two processes are measured at each …
nl, cn, ru, us, de, it, tr
(code pays fourni par la source)
Accès ouvert
2015
article
OpenAlex
M. N. Achasov, X. C. Ai, O. Albayrak, M. Albrecht et autres
Using data samples collected at center-of-mass energies $\sqrt{s}=4.23$, 4.26, and 4.36 GeV with the BESIII detector operating at the BEPCII storage ring, we search for the production of the charmoniumlike state $Y(4140)$ through a radiative transition followed by its decay to $\ensuremath{\phi}J/\ensuremath{\psi}$. …
nl, cn, ru, us, de, pk, it
(code pays fourni par la source)
Accès ouvert
2013
article
OpenAlex
M. N. Achasov, X. Ai, O. Albayrak, D. Ambrose et autres
Using a sample of $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}\ensuremath{\psi}(3686)$ events collected with the BESIII detector at BEPCII, the decays ${\ensuremath{\eta}}_{c}(2S)\ensuremath{\rightarrow}p\overline{p}$ and ${h}_{c}\ensuremath{\rightarrow}p\overline{p}$ are searched for, where ${\ensuremath{\eta}}_{c}(2S)$ and ${h}_{c}$ are reconstructed in the decay chains $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\eta}}_{c}(2S)$, ${\ensuremath{\eta}}_{c}(2S)\ensuremath{\rightarrow}p\overline{p}$ and $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{h}_{c}$, ${h}_{c}\ensuremath{\rightarrow}p\overline{p}$, respectively. No significant signals are observed. …
cn, ru, us, it, nl, tr, de, pk
(code pays fourni par la source)